<template>
    <div class="login_container">
      <div class="login_box">
          <!-- 头像区域 -->
          <div class="avatar_box">
              <img src="../assets/logo.png">
          </div>
          <!-- 登录表单 -->
          <el-form class="login_form" :model="loginForm" :rules="loginFormRules" ref="loginFormRef">
              <el-form-item prop="username">
                  <el-input prefix-icon="iconfont icon-user" v-model="loginForm.username" placeholder="用户名"></el-input>
              </el-form-item>
              <el-form-item prop="password">
                  <el-input prefix-icon="iconfont icon-3702mima" v-model="loginForm.password" type="password" placeholder="密码"></el-input>
              </el-form-item>
             <el-form-item class="btns">
                 <el-button type="primary" @click="login">登录</el-button>
                 <el-button type="info" @click="resetLoginForm">重置</el-button>
            </el-form-item>
          </el-form>
      </div>
    </div>
</template>

<script>
export default {
  data () {
    return {
    // 登录绑定表单数据
      loginForm: {
        username: 'admin',
        password: '123456'
      },
      // 表单验证规则
      loginFormRules: {
        //  用户名验证
        username: [
          { required: true, message: '请输入登录名称', trigger: 'blur' },
          { min: 3, max: 10, message: '长度在 3 到 10 个字符', trigger: 'blur' }
        ],
        // 密码验证
        password: [
          { required: true, message: '请输入密码', trigger: 'blur' },
          { min: 6, max: 15, message: '长度在 6 到 15 个字符', trigger: 'blur' }
        ]
      }
    }
  },
  methods: {
    //   重置事件
    resetLoginForm () {
      this.$refs.loginFormRef.resetFields()
    },
    // 登录事件
    login () {
      this.$refs.loginFormRef.validate(async valid => {
        if (!valid) return
        const { data: res } = await this.$http.post('login', this.loginForm)
        if (res.meta.status !== 200) return this.$message.error(res.meta.msg)
        this.$message.success('登录成功')
        // 将登陆成功的token保存到客户端的sessionStorage中
        // 项目中除了登录之外的API接口，必须在登陆之后才能访问
        // token只应在当前网站打开期间生效，所以将token保存在sessionStorage中
        window.sessionStorage.setItem('token', res.data.token)
        // 通过编程式导航跳转到后台主页，路由地址是/home
        this.$router.push('/home')
      })
    }
  }
}
</script>

<style lang="less" scoped>
 .login_container{
     align-items: center;
     background-color: slateblue;
     height: 100%;
}
.login_box{
   background-color: #fff;
   width: 450px;
   height: 300px;
   border-radius: 4px;
   position: absolute;
   left: 50%;
   top: 50%;
   transform: translate(-50%,-50%);

   .avatar_box{
       width: 130px;
       height: 130px;
       background-color: #fff;
       border-radius: 50%;
       border: 1px solid #eee;
       box-shadow: 0 0 10px #ddd;
       padding: 10px;
       position: absolute;
       left: 50%;
       transform: translate(-50%,-50%);
       img{
           width: 100%;
           height: 100%;
           border-radius: 50%;
           background-color: #eee;
       }
   }
}

.login_form{
    position: absolute;
    bottom: 0px;
    width: 100%;
    padding: 0 10px;
    box-sizing: border-box;
}

.btns{
    display: flex;
    justify-content: flex-end;
}
</style>
